Mole to Mole Stoichiometry

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

(a)  

4 Al + 3 O₂ –> 2 Al₂O₃

It would take (a)   moles of aluminum to completely react with 2.4 moles of O_2.

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 10 moles of NH₃ react with 30.0 moles of NO?

4 NH₃+6 NO --> 5 N₂ + 6 H₂O

• NH₃

• NO

• N₂

• H₂O

Tags

NGSS.HS-PS1-7

2 Al + 3 Cl₂ ---> 2 AlCl₃.

If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• aluminum

• chlorine

• aluminum chloride

• All of the reactants run out at the same time.

N₂ + 3H₂ → 2NH₃

There are 0.150 moles of nitrogen that react. This means that (a)   moles of ammonia (NH₃) is produced.

Tags

NGSS.HS-PS1-7

4 NH₃+6 NO --> 5 N₂ + 6 H₂O

When the reaction is complete, 0.15 moles of nitrogen are made. This means that (a)   moles of ammonia, (NH₃) will be needed to make the reaction happen.

Tags

NGSS.HS-PS1-7

4NH₃ + 5O₂-->4NO + 6H₂O

To make the reaction happen, (a)   moles of oxygen are needed to make 0.36 moles of NO.

Tags

NGSS.HS-PS1-7

4NH₃ + 5O₂-->4NO + 6H₂O

During the reaction 1.2 moles of water are made. This means that (a)   moles of NO are also made.

Tags

NGSS.HS-PS1-7

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

A student burns 1.50 mol C₃H_8. This means that (a)   moles of oxygen are also used.

Tags

NGSS.HS-PS1-7

If the red spheres represent atom A and the Green spheres represent atom B, what is the excess reactant?

• There is extra A after the reaction

• There is extra B after the reaction

• There is extra AB after the reaction

• All of the reactants run out at the same time.

Tags

NGSS.HS-PS1-7